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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: Gtk.Image.Gtk_Image
Date: Sat, 26 Mar 2022 09:59:08 +0100
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On 2022-03-26 02:38, Thomas wrote:
> In article <t1l90i$1otm$1@gioia.aioe.org>,
>   "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> wrote:

>> It is recursive, but it affects only actual children. New children are
>> hidden by default. I think this is going to change in GTK 4.
> 
> i understand that about mcc.tki.Widget.Picture.Set_Image.
> 
> but in mcc.tki.Widget.Picture.Create,
> when i call Gtk.Container.Add, and then Gtk.Widget.Show on the
> container, it doesn't work.
> i need to call Gtk.Widget.Show on the image too.
> 
> (no matter if i don't understand, at least that works :-) but if you
> have enough patience, i like understand things :-) )

Maybe the widgets involved must be "realized" for recursive Show to 
work? The allocation size might be needed correctly set. Maybe the image 
is actually rendered but at a wrong place and size where it is not 
visible. There are many ways to mess it up.

>> Gtk_Fixed is bad because it breaks widget resizing protocol. If you
>> never resize (e.g. when changing the widget style, fonts, for example)
>> then Gtk_Fixed is just fine.
> 
> i don't understand details, but i think since RAPID was designed with
> Gtk_Fixed I can keep it without inconvenience in the short term.
> (i plan to make an other design in the medium term.)

RAPID is a GUI generator thing, right? So it tries to manage the layout 
by itself instead of using the prescribed techniques. Then Gtk_Fixed is 
a way to go.

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de